How large up to3 mm u can use white cement mixed with grout a little bit of titebond all purpose wood glue.
Fix gap between countertop wall.
Using a ruler or a tape measure find the width of the.
The problem is that the walls seem to have a serious bow to them and where the countertop pieces join in the corner there is about a 1 inch gap between the backsplash and the wall.
Using clear tube will make it close to invisible.
Purchase clear pvc tubing 1 4 inch 0 64 cm thicker than the gap.
This keeps the foam from showing through the subsequent caulk job.
It is flexible and will stretch as the walls move with the weather.
When dry cut the foam back with a new razor knife angling it down into the gap slightly then run a putty knife in the gap to keep the foam 1 16 below the surface of the splash.
Locate the screws holding the cabinet to the wall which are inside the.
I have used it myself.
Also the design plan should have had the counter ending a couple of inches before the wall.
Paint it the color of the tile you will be installing.
Your second option is to add a small piece of molding across the top of the countertop splash edge to cover the gap.
Raise the cabinets to close the gap.
If the gap is less than about 1 4 inch or so you can simply caulk the crack.
Filling the gap with plastic tubing 1.
If there is say an inch to inch and one half overhang across the front of your slab maybe the slab could be slid back say one half inch closer to the wall closing the gap enough that when you add a backsplash you could fill in the difference with foam backer stuffed into the space between back of countertop and wall and then use flexible caulk to close the gap would depend on how thick your backsplash is as to whether this might be a viable fix.
If it s not too wide i d line the back of the counter with crown molding or wall trim of some kind paint it with a high gloss paint so that it s washable.
The countertop is an l shape so we have the pre cut miter ends that join together in the corner.
Paintable caulk with maybe a backer rod will fill that small gap.
Push the tubing.
You are going to have issues with interfacing with the base trim now.
There are two ways to address this.
If the gap between the countertop and backsplash is more than 3 8 inch it s.
Clean up any foam chunks with a vac and remove the tape.
Add a quarter round molding paint it the color of the walls.
Then paint it the wall color.
I d use acrylic latex caulk for that.
Peel and stick tile is very thin it will not fill in the gap.